This fixes <https://sourceware.org/bugzilla/show_bug.cgi?id=18781>
whereby, on 32-bit platforms, libc 2.22 would fail to pass O_LARGEFILE
to 'openat'.  This was caught by 'tests/sparse03.at' in the tar
test suite.

commit eb32b0d40308166c4d8f6330cc2958cb1e545075
Author: Andreas Schwab <schwab@suse.de>
Date:   Mon Aug 10 14:12:47 2015 +0200

    Readd O_LARGEFILE flag for openat64 (bug 18781)

--- a/sysdeps/unix/sysv/linux/openat.c
+++ b/sysdeps/unix/sysv/linux/openat.c
@@ -68,6 +68,11 @@ __OPENAT (int fd, const char *file, int oflag, ...)
       va_end (arg);
     }
 
+  /* We have to add the O_LARGEFILE flag for openat64.  */
+#ifdef MORE_OFLAGS
+  oflag |= MORE_OFLAGS;
+#endif
+
   return SYSCALL_CANCEL (openat, fd, file, oflag, mode);
 }
 libc_hidden_def (__OPENAT)
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